Her fortune is valued at £360 million ($466.2 million). She gets 15% of the profits from the Crown Estate property portfolio as well as an allowance derived from taxpayer money. She also has an extensive collection of valuable assets, such as art, jewellery, and cars.

15. The Duke of Northumberland: Net worth — £370 million ($479.36 million). The Duke (pictured here with his daughter on her wedding day) owes his wealth to inheriting assets such as Alnwick Castle, which has been in the family for more than 700 years. He also has an extensive estates portfolio, including 120,000 acres in Northumberland.

Melissa Percy arrives with her father, the Duke of Northumberland, for her wedding to Thomas Straubenzee in 2013.PA

14. Charlotte Townshend: Net worth —£425 million ($550.5 million). Townshend is the only other person, other than the Queen, that is allowed to own wild swans. Her wealth mainly comes from estate companies and farming. One of the most lucrative estates she owns is 20 acres of land around the affluent Holland Park area in London.

The Prince of Wales greets Charlotte Townshend in 2006.PA

13. The Duke of Sutherland: Net worth — £580 million ($751.39 million). Francis Ronald Egerton is the 7th Duke of Sutherland and most of his wealth comes from his art collection and 12,000 acres in the Scottish Borders and East Anglia.

Winston Churchill and the current Duke of Sutherland's ancestor (R) on the beach in 1927.PA

12. Duke of Bedford: Net worth — £707 million ($915.81 million). Andrew Ian Henry Russell is the 15th Duke of Bedford and is heir to two family companies as well as house and grounds valued at £150 million. His extensive art collection includes 24 Canalettos, paintings by artist Giovanni Antonio Canal, worth £450 million alone. However, he makes a lot of money off lucrative estates in London, such as 180 buildings in the affluent Bloomsbury.

11. Lord Rothschild: Net worth — £735 million ($952.2 million). Rothschild chairs RIT Capital Partners, which he built into a £2.57 billion company, after departing from the family bank. He also retains vast amounts of land surrounding Waddesdon Manor estate in Buckinghamshire before it was given to the National Trust in 1957.

Lord Jacob Rothschild arrives at St Bride's Church in London for a ceremony to celebrate the wedding of Rupert Murdoch and Jerry Hall.PA

10. Prince Jonathan and Princess Gesine Doria Pamphilj: Net worth — £750 million ($971.7 million). British orphans, Prince Jonathan and Princess Gesine (pictured), were adopted by Royal Navy officer Frank Pogson and London-born Princess Orietta Doria-Pamphilj — from an Italian noble family. Their inheritance accounts for all their wealth as they own a palace in Genoa, an art collection and the Palazzo Doria Pamphilj in Rome.

9. The Duke of Devonshire: Net worth — £880 million ($1.13 billion). Like most of the aristocrats on this list, the Duke of Devonshire's wealth comes from owning large amounts of land, such as Chatsworth House in Derbyshire and a 30,000-acre Yorkshire estate.

The Duke and Duchess and Devonshire.PA

8. The Earl of Iveagh and the Guinness family: Net worth — £890 million ($1.153 billion). Ned Guinness, a descendant of Arthur, who invented the drink in 1759, sold the family mansion in Farmleigh, Dublin's Phoenix Park, which he grew up in 1999. But his vast wealth landed on him after he became 4th Earl of Iveagh in 1992 as he inherited £62 million in Guinness shares. He and his family's stake in Diageo, which owns Guinness, is worth £230 million.

New born baby Arthur Edward Rory Guinness with parents Lord Iveagh (Arthur Francis Benjamin Guinness) and Lady Iveagh (Miranda Guinness) after his birth on August the 10th 1969.PA

7. Viscount Rothermere and family: Net worth — £930 million ($1.204 billion). Jonathan Harmsworth, the Viscount, took control over the Daily Mail & General Trust in 1998 when his father died. The family stake is worth £630 million and the rest of his wealth derives from dividends and property in London and the south-west of England.

Viscount Rothermere.Reuters

6. Robert Miller and Princess Marie-Chantal and family: Net worth — £1.58 billion ($2.047 billion). Crown Princess Marie-Chantal is rich because her father Robert Miller made his fortune co-founding the Hong Kong-based Duty Free Shoppers chain in 1960. She then married Pavlos, the son of former King Constantine II of Greece, who was deposed in 1973.

Crown Princess Marie-Chantal of Greece, daughter of Robert Miller.Getty

5. Viscount Portman and family: Net worth £2.003 billion ($2.59 billion) — . Christopher Edward Berkeley Portman, the 10th Viscount Portman, owns an estate which includes 110 acres of land in central London, which gives him and his family huge amounts of wealth. On the estate, the group let out residential properties across some of the most affluent areas in London, including shops in Baker Street.

4. Baroness Howard de Walden: Net worth — £3.73 billion ($4.83 billion). Christopher Edward Berkeley Portman, the 10th Viscount Portman, owns an estate which includes 110 acres of land in central London. On the estate, the group let out residential properties across some of the most affluent areas in London, including shops in Baker Street.

Wiki Commons

Net worth: £3.63 billion

Age: 80

The Baroness, eldest of four daughters of the late Lord Howard de Walden, increased the family's fortune by £400 million in 2014 to 2015, mainly due to their control of 90 acres of central London land.

3. Lady Charlotte Wellesley: Net worth — £3.8 billion ($4.99 billion). The 26-year-old's wealth largely derives from being married to Alejandro Santo Domingo in 2016. Domingo is a 40-year-old Colombian-American billionaire and Lady Charlotte is the Duke of Wellington's daughter.

The wedding of Lady Charlotte Wellesley and Alejandro Santo Domingo in Granada, Spain.PA

2. Earl Cadogan: Net worth — £6.5 billion ($8.41 billion). Charles Gerald John Cadogan cultivated a massive fortune through the property company Cadogan Group. In 2014, the group bought almost 200 properties. He's been a huge beneficiary of the London property-price boom as the Cadogan Group owns 93 acres in Chelsea — one of the capital's prime locations.

The Right Honourable the Earl Cadogan from London is knighted by Queen Elizabeth II at Buckingham Palace.PA

1. The Duke of Westminster and the Grosvenor family: Net worth — £9.52 billion ($12.33 billion). Hugh Grosevenor became the Seventh Duke of Westminster after his father Gerald Cavendish Grosvenor died in August 2016. The family makes most of their money from inherited land that dates back to 1677, including land in wealthy London areas like Belgravia and Mayfair.

The 7th Duke of Westminster, Hugh Grosvenor, arriving for a memorial service to celebrate the life of his father, the sixth Duke of Westminster at Chester Cathedral, Chester.PA